First of all I never know how long my fasts are going to be until they are over. So I never actually set an amount of days. There are too many things that can and have gotten in the way of completing long fasts. If I could book into a fasting retreat and avoid all other responsibilities for a set period of time that might be different, but most of us I think have to keep functioning and working etc and that often requires some sacrifice in the fasting process, I know it has for me.
But suggesting a fast to anyone is something for a health practitioner to do, which I am not. I am just someone who has benefited from fasting and is happy to share my experience with others who choose to try it. Fasting is very much about healing yourself and becoming your own doctor. How people conduct their fasts will be an individual matter depending on many factors, their health, their lifestyle etc. To just tell someone it's okay to go and fast for 30 days is ignoring a lot of factors that may well have a bearing on the outcome of such a fast. It is important for us all to realise that we do have our lives in our hands, and I would never say it was safe for anyone to fast because we all have to make that decision for ourselves. It is a responsibility we must each take on ourselves after careful consideration. As long as the Mainstream ignores Fasting many of us are on our own. That's why support forums like this one are so important.